All New "Light Rail 4 AdjustaDrive" now with fully adjustable variable speed control between 6 and 10 r.p.m. and 0 to 60 second adjustable time delay for promoting even plant growth at the ends of the lamps travel. With both a 0 to 60 second adjustable time delay for promoting even growth from end to end and the added feature of a two to four feet per minute adjustable speed control that covers a wide range of lamp intensities and travel distances, LightRail 4.0 is great for customers who want that additional control. Kit Includes: (1) AdjustaDrive Motor A two piece, 2 meter Rail Installation hardware Instructions LightRail AdjustaDrive 4.0 Instructions Free eBook 'Planning Your Space with LightRail'